Panasonic KX-TC2000NZF, KX-TC2000NZB, KX-TC2000NZW manual Power Supply Circuit

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KX-TC2000NZB / KX-TC2000N ZW / KX-TC2000NZF

19.2. Power Supply Circuit

The power supply to the CPU (Digital, Analog) and RF IC from AC Adaptor (+12V) is shown in the diagram below.

The base unit power supply is DC12V. The handset´s power is supplied from 3.6V battery (Nickel-Cadmium battery) which is installed in the handset.

Power supply for transmitter is turned on by a press of "Talk" key on the handset. During the stand-by mode, the unit stops transmitting but receives the signal.

Also during on-hook condition (the handset is placed on the base unit), backup power for memory of the last dialed number is supplied through the battery. The memory of this unit is not backed up by the current from

the telephone line.

The base unit DC power supply is regulated by Q18, the CPU power is regulated by Q19. The Q401, Q403 detects AC Adaptor power failure and maintains the unit security code.

Fig. 1

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Image 41

Contents KX-TC2000NZB KX-TC2000NZW KX-TC2000NZF Contents Cabinet and Electrical Parts Location Handet Suggested PbF Solder About Lead Free Solder PbF Pb freeBase Unit Main PCB How to recognize that Pb Free solder is usedFor Service Technicians Recharge Battery information BatteryBattery Replacement Base Unit Handset Location of ControlsConnection For Service Hint Making Calls Answering Calls OperationsKX-TC2000NZB / KX-TC2000N ZW / KX-TC2000NZF KX-TC2000NZB / KX-TC2000N ZW / KX-TC2000NZF Recall Button Show in Fig Procedure To remove Remove Disassembly InstructionsRear Cabinet Battery compartment cover Troubleshooting Guide Check Power Bell Reception Check Battery Charge CPU IC2 RF IC IC1 Check LinkRefer to Adjustment P.29 Check Handset Reception Check Handset TransmissionTest Mode Flow Chart Base Unit Adjustments Base UnitAdjustment How to change the channelIC1 Adjustment Standard Base UnitTest Mode Flow Chart Handset Adjustments HandsetIC1 How to change the channel AdjustmentComponent View Adjustment Standard HandsetFlow Solder Side View Base Unit RF SpecificationHOW to Check the Handset Speaker Frequency Table MHz STAND-BY TALK, Talk STAND-BY Explanation of CPU Data CommunicationRinging Changing the Channel Ports for transmitting and receiving of data RF IC IC1 Block Diagram Base UnitIC2 Block Diagram HandsetOutline Circuit OperationPower Supply Circuit Reset Circuit Base Unit Dtmf Charge CircuitTelephone Line Interface Base to Handset Transmitter/ReceiverHandset to Base Signal Route Circuit Operation Handset Reset Circuit HandsetBattery Low / Power Down Detector 21.1. IC2 22.1. IC2 23.1. IC1 Procedure HOW to Replace Flat Package ICModification Procedure of Bridge PreparationCabinet and Electrical Parts Location Base Unit Cabinet and Electrical Parts Location Handet Accessories and Packing Materials Cabinet and Electrical Parts Replacement Parts ListDiodesi LED LED1 ERDS2TJ223 PQXA36ASVC Battery Accessories and Packing Materials Handset Schematic Diagram Handset For Schematic DiagramBase Unit Schematic Diagram Base Unit 30.1 Base Unit Schematic Diagram Base UnitFILTER\2 RF Unit Base UnitSchematic Diagram Handset IC1 31.2 RF Unit HandsetMemo Component View Circuit Board Base UnitRX-VCO TX-VCO Flow Solder Side ViewIC2 IC1 KXTC2000NZB